Improvement of electrochemical properties of MgO-coated LiNi0.4Co0.2Mn0.4O2 cathode materials for lithium ion batteries

被引：15

作者：

Han, Enshan ^{[1
]}

Liu, Xiangtao ^{[1
]}

Zhu, Lingzhi ^{[1
]}

Pan, Chao ^{[1
]}

Wu, Zhiqin ^{[1
]}

机构：

[1] Hebei Univ Technol, Sch Chem Engn & Technol, Tianjin 300130, Peoples R China

来源：

IONICS | 2013年 / 19卷 / 07期

关键词：

LiNi0.4Co0.2Mn0.4O2; Cathode; pH; MgO-coated; Electrochemical properties; PERFORMANCE; BEHAVIOR; LI(NI1/3CO1/3MN1/3)O-2; STORAGE;

D O I：

10.1007/s11581-012-0825-6

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

The surface of LiNi0.4Co0.2Mn0.4O2 cathode is coated using MgO coating materials. The electrochemical properties of the coated materials are investigated as a function of the pH value of the coating solution and the composition of coating materials. Their microscopic structural features have been investigated using scanning electron microscopy and X-ray diffraction. The electrochemical properties of the samples were monitored using coin-cell by galvanostatic charge-discharge cycling test, EDS test, EIS test, and cyclic voltammetry. The coating solution with pH = 10.5 is found to be favorable for the formation of stable coating layers, which enhances the electrochemical properties. In contrast, 2 % MgO-coated LiNi0.4Co0.2Mn0.4O2 shows better cycle performance and rate capability than the bare sample. Such enhancements are attributed to the presence of a stable MgO layer which acts as the interfacial stabilizer on the surface of LiNi0.4Co0.2Mn0.4O2.

引用

页码：997 / 1003

页数：7

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